Liquid-fuel furnace.



H. E. YARROW.

LlQUlD FUEL FURNACE.

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:XPPLICATION HLED AUG. 1', 1916- Jvfara Z02 Patented 111ay14,1918.'

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H. E. YARROW. LIQUlD FUEL FURNACE.

I APPLICATION FILED AUG. 1916. 1,266,372. v Patented May14,1918.

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frraw m H. E. YARROW.

LIQUID FUEL FURNACE. APPLICAHON HLED AUGJ, 191s.

Patented May 14; 1918.--

4 SHEETS-SHE Zita 0 zdgz gs :5 0 Jimmy J W rring WZM H. E. YARROW. LlQlHD FUEL FURNACE. APPLICATION FILED AUG.1. 191a. 1,Q66,372, Patented May 14, 1918'.

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HAROLD EDGAR,YARROW, OF GLASGOW, SCOTLAND.

LIQUID-FUEL FURNACE.

Application filed August 1, 1916.

To all whom it may concern:

Be it"known that I, HAROLD EDGAR YAR- now, a subject of the King of Great Britain, residing at Scotstoun Glasgow, Scotland, have invented certain new and useful Improvements in or Relating to Liquid-Fuel Furnaces, of which the following is a specification.

hen a boiler furnace is fitted for burning oil, there are generally a number of oil spraying and air distributing arrangements fitted to each boiler. For instance, on a warship of a destroyer type there may be as many a'slten oil sprayers, and ten air distributers to each furnace. When working at varying powers it is necessary to shut on or open in rapid manner one or more of the sprayers, and 'at'the same time close or open the corresponding air shutters. ,In practice it has been found that when the controls of the oil sprayers and the air distributers are kept quite separateand have no cooperative relation, sometimes the oil sprayers'havebeen opened out without any air being admitted, the resultof which is to flood the furnace with oil andgive riseto blacksmoke; on the other hand when closing down an oil sprayer the air dampers or throttles have been left open thereby admittingcoldair to the furnace at a'place' where it is not required for combustion, thus reducing-t'he efficiency of the boiler.

Such DilSllELPS cannot occuryhoweveiy if means he provided for controlling the oil and air supplies simultaneously. It has, therefore been previously suggested in the case of'furnacesfitted with oil fuel burners arrangedabove an air chamber that the supply of air to the chamber be regulated by nieans of a damper consisting of one or more hinged flaps which are adapted to be operated or controlledby the movement of the regulatorcontrolling the supply of oil fuel to the burners. The present invention relates. to furnaces which are provided with an oil burning installation either in conjunction with or without means for burning coal or other Solidfuel and are of the kind wherein the installation comprises one or more oil spraying-devices fitted to; the furnace and in which each of these devices is associated with a separate or individual air chamber/or box having two or more air doors, I and: it consists'in improvements wherebyby one operation, all thedoors of Specificationof Letters Patent.

Patented May 1a, 1918.

Serial No. 112,611.

any individual air box can be closed together and simultaneously with the shutting ofi of the oil supply to the sprayer associated with that air box. The air-door closing mechanism is so constructed that when the oil fuel is shut off it will be operated to engage and thereby close the doors and when the oil fuel is turned on, the part or parts adapted to cotiperate with the doors are withdrawn away from the doors which are thus left free to operate or swing automatically.

The invention will be described with reference to the accompanying drawings in which Figures 1 and 2 show respectively the front and sectional side elevation on line 22 of Fig. 1 of an air box and a pair of non-return air-doors comprised in an oil burning installation, indicating one mode of 4 putting the invention into practice.

Figs. 3 and a show also the front and sectional side elevation on line il of Fig. 3 of an air box with a pair of air-doors and illustrates an alternative method by which the invention may be. carried out.

In Figs. 1 and 3 the air doors and the oil fuel supply cock are shown closed. and in Figs. 2 and d the doors and supply cock are open, and the supply piping of the fuel sprayer as shown in Figs. 1 and 3 isv omitted. In the several figures corresponding parts a re indicated by similar reference letters.

In carrying out the invention, an air box A is fitted to the front wall B of furnace and incloses a suitable air distributor, which is not shown but would be of known construction and'be arranged opposite to a fuel and air admission opening as usually provided in a furnace front. In the front wall of the air box A is fitted a device 7' adapted to spray oil in customary manner through the air distributer and into the furnace. The air box A is provided with a number of pivotally mounted air doors 7c, of which two only are shown in each figure of the drawing. Attached to the front of the box A is a bracket p for the support of the oil spraying device 7' adapted to be fed with oil by means of the piping 9 provided with the fuel cock f which is controlled by a hand lever a. i

In the arrangement shown in Figs. 1 and 2, a lever b is fixed to the spindle of the cock f and has a pin 5/ that works in a slots of are constructed so as to have an inherent tendency to swing into and remain in the open position denoted in Fig. 2 under the action of air pressure outside the air box, but they can be returned into a closed position by the action of the bar 0 and levers a and b. The raceway e for the greater portion of its length is shaped as an arc of a circle but its terminal portions 6 may be made to deviate somewhat from extensions of that are for a purpose hereinafter described.

Supposing the doors is and cock f are open as in Fig. 2, then to shut off the oil fuel and close the doors 7; the hand lever a is operated and turned through an angle, from the I position indicated in full lines in Fig. 2, wherein the cock 7 is fully open, to the broken line position in which the cock is entirely closed and the oil supply to the sprayer j is shut oil. As the spindle of the cock 7' is turned the lever 7) attached to it moves the bar 0 inward along the slots in the guide bars (Z from the full line position, Fig. 2, to the broken line position. The bar 0 in then moving will through its ends press upon' the doors is turning them from the open to the closed position indicated in broken lines in Fig. 2. Upon the lever a being returned, the cock 7 will be opened and the bar 0 will be withdrawn out of the way of the doors is which will thus be free to open automatically under the action of external air pressure and to shut again should a back draft occur in the furnace.

The lever 61. may be prevented from going too far in one direction by the pressure of the bar 0 on the doors la when they are shut, and in the other direction by the bar 0 c0ming to the end of the slots in bars (Z. The levers a and Z) can be held in the extreme open and shut positions by causing the pin 9 to enter the terminal portions 6 of the raceway e, the holding eiiect being due to the spring in plate 6 and in the casing to which the plate is attached.

If desirable, the ends of the bar 0 may carry rollers engaging the doors is.

In the construction illustrated in Figs. 3 and l, the hand lever a instead of being mounted on the spindle of the fuel cock 7 is fixed to an actuating shaft n which can be conveniently supported on bearings h fixed to the bracket ,0 carrying the sprayer j. A lever Z is fixed at each end of the shaft a and in lieu of a single bar 0 as in the arrangement shown in Figs. 1 and 2, two pairs of bars 7* are employed. The bars 2* swing on pins 0 fixed in the adjustable forked rods (Z carried by the air box front. The two bars constituting a pair are connected together by a pin and slot connection 9*.

The lever Z) on the spindle of the cock 7 is coupled to one of the pairs of bars r by a link m and it moves together with that pair of bars when the hand lever a is actuated.

' "If the doors is and lever a be in the open position as shown in full lines in Fig. 4, then to close the doors and shut the oil fuel cock the hand lever a on the actuating shaft 11. is pushed toward the front of the air, box to the broken lineposition, whereupon the bars 7 are caused to turn on their pivots 0, their outer ends bearing against the doors 7c in a manner to close the doors.

The bars 7" after they have caused to close the doors 7; may be withdrawn sothat the doors become free to swing automatically under pressure actions.

Having thus described the nature of my said invention and the best means I know of carrying the same into practical effect, I claim v I 1. An apparatus of the class described, comprising an air box forapplication tothe wall of an oil-burning furnace and containing a device for spraying oil into the furnace, a plurality of air doors controlling the admission of air to the air box, the said doors being ivoted to open automatically under the action of the external air pressure and to shut under the action of a back draft in the furnace, a cock for shutting ed the supply of oil fuel to the spraying device, a hand lever adapted to open and close the cock, and

means operated by. the said lever. tojsimultaneously close all the air doors of the, air box when the said cock is shut.

2. An apparatus of the class described, comprising an air box for application to the wall of an oil-burning furnace and containinga device for spraying oil into the furnace, a plurality of pivoted air doors operating together, to control the admission of air to the air box, a cock for shutting ed the supply of oil fuel to, the spraying device, a hand lever adapted to open and close the cock, a bar bearing against an air door, and means by which, when the hand lever is operated to shut the said cock, the bar is moved to close the pivoted air door.

3. An apparatus of the class described, comprising an air, box forapplication to the wall of an oil-burning furnace and containing a'device for sprayin oil into the furnace, a plurality of pivoted air doors operating together to control the admission of air to the air box, a cock for shutting of the supply'of oil fuel tothe spraying device, a hand lever for opening and a closing the cook, a bar bearing against an air door and having aslot therein, and a pin actuated by the said hand lever and working in the slot of the said bar to close the air door when the said cock is shut.

a. An apparatus of the class described, comprising an air box for application to the wall of an oil-burning furnace and containing a device for spraying oil into the furnace, a plurality of pivoted air doors operating together to control the admission of air to the air box, a cock for shutting oil? th supply of oil fuel to the spraying device, a hand lever for opening and closing the cook, a bar of which the outer ends bearing on the outwardly projecting parts of the air doors are moved inwardly to close the said doors when the hand lever is operated to shut the said cock.

5. An apparatus of the class described, comprising an air box for application to the wall of an oil-burning furnace and containing a device for spraying oil into the furnace, a plurality of pivoted air doors operating together to control the admission of air to the air box, a cock for shutting off the supply of oil fuel to the spraying device, a hand lever for opening and closing the cock, pairs of bars pivoted at their centers and bearing against the air doors, an arm associated with said cock and a link connecting the said arm with the pivot of one pai of bars.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HAROLD EDGAR YARROW.

Witnesses:

JALMZES RITCHIE, Cmnssm M. WATSON.

Copies of this patent may be obtained for five cents each, by addressing the "commissioner of Patents,

Washington, D. G. 

